Postpartum paralysis in cows is an acute hypocalcemia that occurs before and after delivery. In recent years, with the rapid development of the cattle industry, the incidence rate of postpartum paralysis in high-yield cows has increased year by year, which has brought great economic losses to the majority of farmers.

The etiology of postpartum hemiplegia in cows is not fully understood, and most scholars believe that the direct cause of the problem is the decline of parathyroid gland function and dysfunction of blood glucose regulation in cows. Especially after a cow gives birth, a large amount of blood calcium in the body will enter the breast and be excreted with milk. At this time, the absorption of calcium in the cow's intestines is relatively slow, and if it cannot meet the growth needs, it will lead to low blood calcium and postpartum paralysis symptoms.

The clinical symptoms and typical prodromal symptoms are characterized by nervous and restless movements, cessation of food intake, and tremors in the head and feet. Soon the sick cow showed difficulty standing, ataxia, and inability to lie down. After lying on the ground, the head and neck often curve slightly in an "S" shape, or the head is turned back and placed on the shoulder blades in a "chest horizontal" position. The nose is dry, the peripheral skin is cold, the body temperature drops below normal, the eyes are dull and staring, drowsiness, the pain reflex gradually decreases, the anal reflex disappears and relaxes, gastrointestinal peristalsis disappears, neck spasms and limbs become relaxed, heart sounds weaken, pulse is weak, breathing is deep and slow, and the body temperature drops to 35 ℃ -36 ℃.

Diagnosis can be made based on the parity (multiple parity), onset time (postpartum), characteristic symptoms (perceptual loss, paralysis), and decreased blood calcium concentration (generally below 8 mg, normal is 9-12 mg) and blood phosphorus (1.0-2.7, normal is 5-8 mg) of the diseased cow. Observation on animal B-ultrasound shows abnormal heartbeat and signs of atrophy in the parathyroid gland

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